package java11;

public class Cool015 {
	public static void main(String[] args){
       for(int i = 1;i<=20;i++){
    	   for(int j= 1;j<=20;j++){
    		   if(i==1||i==20){
    			   System.out.print("*");
    			   
    		   }else{
    			   if(j==1||j==20){
    				   System.out.print("*");
    			   }else{
    				   System.out.print(" ");
    			   }
    			
    		   }
    		   
    	   }
    	   System.out.println();
       }
	}
	}



